Scale and thermostat therefor



s. w. KING Mm C. BURKHHSER; SCALE AND THERMOSTAT THEREFOR,

APPLICATION FILED DCT. 20. |918.

2 SHEETS-SHEET I.

i?. W, iNG AND C. BURKHElSER.

SCALE MJD YHEBMOS/U THEREFOR.

AFPLICATEOH FILED CY. 20. ISIS.

Bernois fiorini-cerro scese Gemeen?, rit-miens, n ooeroeezoii it known that ne 55.7. Kino enel C. BURKHESER, ooth ciizens of she U iiecl States, residing et etroit in. "che county of layne enrl Stae oi lmichigan, have invenecl certain new mici useful iniproveniens in Scales and '.herinos'lgos Therefor, or". which *che ollowiing is e foil? clear, and exact description.

This invention relates io cert-ain new and useful inigrovemcnts in herinostnts for spring scales oi?. 'he 'forni shown and ilescribed in the peen co Joseph oplrinson, No. 770,80?.

adapted to very the p .n or a .ivot on the scale lever. To i; fjfifo is ott-ached e rod coiniecting wih connterbalencing springs and with tl rocks which operate *che indicating i'iiechanisin. ln the present construclon n pivot s shiecl as heretofore but this pivot connects Wih she'connici-balancing springs alone, sind the indi color ri l connecion is seoarete and dis tincy hereiiroin and remains reloively rl with respect o jche scale. l at ail cimes. rThis. consi-ruf on has been round to he more satisfactory, 'i'.,he rock anni Qinion parts of a scale exrenely scnsiivc and move nient of he rocks liable to 'the accuracy oi"he scale,

."n corrcciog spring' scales for 'temperature errors there are 'wo femore to be coinpensated for: @ne zero balance and rho, other loaci balance. Springs shorcn ab low temperatures and elongate ai h'gh eiipera. tures. This veria'ion :uecs 'che zero belzrnce of' the scale. Spi i ecco ie .'znore flexible at high temperitores nd less flexible as low reinperenn hose spring changes affect he loml be of the scale, ln the Hopkinson potenz e load balance (which most ein 1, ing) was compenseed for oy th moset, and supplementary d x shown in Hopkinson Patent l have frequently been used *io corre'ci'r.y scales for zero belance.

@ne of he objects oi? Jche presen invention is io provide mechanism whereby loo'lh zero and load balance Wili he compenseec for by hehermoszzz associeed with the scale lever and che use of suppleine-niarj,7 zero compensating levi es may obvia-Leo.

Seriell En,

@ther objects of the present invention wil iortn in detail 1n Ihe accompanying speolicofion, shown in che drawings and iore particularly defined in the appended ciainis.

l? l is e sioe eleaion with certain. parte of the cese broken away ro shon7 the interior cons'rucion. The scale is of lcheV type shown und described the copending applica-cion of C. E. Riedel.,a Ser. No. H1936, fiiee my sexie, me.

Fig. z, is e top pien View or the sonic lever and shows the thermosbet end associaecl parcs in Q Fig, $3 is e central lOngi-ldinel:sectional View of Ithe nose end or' the seele liever and the cleails oi' contain or" vthe parte operate' by hethermcsah i Fig. is a secorml View `aken on line i Fig. 3 and looking in the direction of the arrows. Y

. Wig. 5 is another detail i y sectional View 'taken on line 5 5 o'Fg. 3 and looking in 1h. direction of the arrows.

more dere-ii., 'che sosie comprises the usual bese l() supporting a isha-pecl scale lever ll upon che usuel lenire edges l2. @their knife edges 13 on thel lever support s peiorin FA which ie-menteinecl horizonal by he usual oVcrhee-.cicheclr l5. The indicaing rlrnin 16 is suiteblyjourn ed in a housing at die top of the scale has pinions l' thereon meshing with the racks 18. he racks 'Lire connected with a draft rod 19 in my desired manner. The movement of the scale lever under the influence of various loads is assisted by counterloal-l encing springs 20 suitabl* supported aib -heir upper ends in any lesired manner, as inc ineenc shown voieclel application No. i above referred to;

Tim/moc v and i3 and corresponding with the angle of.

mail! The rear end of theV rod 27 is threaded. -into a wedge block 28. rEhe rear end of the scale lever is made sloping, as shown 29, this sloping plane surface making a slight acute angle with thef line ol the pivots l2 the wedge block 28. Secured by rivets to the sloping face 29 of the lever is a bearing plate 30, and intermediate this plate and the top of the wedge block is a baltcage plate 31. The plate 30 has endend side projecting portions 32 and 33 to prevent the ball cage plate from being displaced from position. rlhe balls in the ball-cage'permit the wedge block to'move freely with respect to the vplate 30. The wedge block is bored transversely to receive a rod or member 34 having downwardly 'pointing knife edges 35 at its ends, as shown in Fig. These knife edges rest in 'agate bearings which are carried in the lower ends of a member B6 which'has connected thereto the lower ends of the spring 20, see Fig. l. The details of the spring connections are not herein described in detail as they are fully explained lin Riedel application heretofore referred to.

Operating comical/ilona to (Im/ft rod and rocks.

Suitably fastened to the rear end of the lever l1 is a bracket ell) having threaded therein and projecting upwardly therefrom a pointed pin #il which rests in a cupped depression in the end of the draft rod 19. ln order to prevent the draft rod being accidentally displaced from the position on the pointed pin ll, a stirrup member el?, is provided which is suitably' fastened -to the.

bracket 40 and which loosely engages in a circumferential notch 43 in the craft rod. This stirrnp providies a ready means for retaining the draft rod in position, but at the same time permits the rod to be easily removed. At the same time friction is minimized as the stirrup is normally clear of the draft rod.

Thermostat operoz'oa.

oereason of the slack-ending and elongation of Lesage? the counterbalancing sprinfrs occurring at such higher temperatures:

7hen"the tern-4 perature falls the reverse action takes placer, In this way the thermostat is effective-` so between the samepivots at low temperatures. Consequently the springs exert the same effective pull upon the lever, regardless of their decreased or increased llexihil ity. The action of the thermostatin varying the effective lever arm, maintains the scale at proper load balance regardless orF temperature.

lt will be understood that invention may be modified in various w as will oecur to those skilled in the art,A and that the present invention is particularly dened by the appended claims.

We claim:

1. ln a scale, in. combination with a lever and a connterbalancing spring therefor, weight indicating mechanism, a draft rod connecting the weight indicating mechanism with the scale lever tov actuate the former, a connection between the spring and lever, a thermostat for compensating the variations in the spring due to changes in temperature, said thermostat being adapt. ed Vto vary the connection of the spring and lever and beingdndependent of the draft rod, whereby the relation tothe draft rod and lever remains unchanged at all temperatures.

2. ln a scale, in'cornbination with a plat-A vthe lever and the weight indicator.

3. In a scale, in combination, a scale lever, a weightresisting spring tensioned thereby, a weight indicator, means connecting the weight indicator with the lever, to actual-e the former, a connection between the spring and lever, a thermostat controlling the connection between the spring and the lever and independent of the means for moving the weight indicator, said thermostat being adapted to vary Jthe initial tension on the spring and thereby maintain correct zero balance. l A

l. ln a scale, in combination, a scale lever, a weight-resisting spring tensioned thereby, a. weight indicator, means connecting the weight indicator with Jthe scale lever to acfor - ing spring lconnected to the. w

cuate the forme?, a connection between spying and lever, a thermosat conti-@lling the connection between elle' Spring and the lever and independent of the means foi' moving the Weight indicator, said allermostat being adapted io very the initial tension on the sp'ing and theeby maintin correct zero balance, and said zheimoste; being also adapted to vary the eective leveeTl arm of lie lever and thereby maiiiein cor bloclr connecting seid elements and shifteble relatively .to one of the same whereby the poinl oconnection of the sprig and the lever can be shifted in two directions, emi e thermostet carried 'by one of said ele mente and conneeed to the Wed e block Teo shift the seme in accordance it temper@ ture changes- 7. lx1-s. scale, in combination, a. scale lever e shiftable Wedge block having'en incline face bearing on Said leverv e Wei hi-eesief ge bloc and temperature-responsive means ceiri lo the lever and cooperating with the Wedge b ook to shift the same.

8. In a scale, in combination, a scale level'9 an upwardly pointed pvot; bearing on one and thereof, e draft :cod resting upon 'seid bearing, and means comprising o stlrrup et- 45 bashed tothe seele lever for preventing the ing (loving lie opemon of 65h 9. line scale, in combination? en poiniiing conical beeeing glieie il roel cupped iis lower end to reet u o seid heaving, en e sim'up eeelie lever and edap'ieel to copefa'e Wien (leeft Foei o prevent lie clisplecemen f draft rcel and 'che bearing dwing; vio cillacon of che scale leve-.

l0. In e scale, in combineion, Seel lever5 en upwardly poinng conice f carried theeby, e rcel eee d y tcelly and having; en lewe? receive said bearing, seid. verl "owing e g'oove thefein eed e by line scale leve poccnf ino Seid groove, mid si p s-eiing cleei'` of loe Cl'et eccooe 333mg edapeil io come@ with lie elle movement o lie. enel slieveby 'ore-voil the mit rod i'om. belg displecein ecole levee (lering opeeon of elle socle,

il. n :i SceleVin combination, e scale lever, an. element compiszig e Weiglic eesicing spring having e ciie le conneenion with the lever, 'themoseiic means essociated with che lever edcpec lelii'f che connection of the leve? en spying relative to the line of tile leve? pivoe veticelly to compensate' foi" elongation commotion of the eprn dile empeeture changes .and ibo there y '5i-Tope? cero belimoe.

in testimony whereof We cui signe tufee m the pzeecnce of two Subscling witnesses.

BERT W. E SNG.

C. BURKHESER.

Witnesoee:

@Hennie REBEL, FELIX Tammo, 

